Magnetic separator.



IVI'. DINGS & R. A. MANEGOLD. MAGNETIC SEPARATOR.

APPLICATION 111w AUGJ. 1911.

Patented Apr. 20, I915.

an area a MYRQN DINGS AND ROBERT A. MANEGOLD, OF MILWAUKEE, WISCONSIN, ASSIGNORS T DINGS ELECTRO-MAGNETIC SEPARATOR (10., OF MILWAUKEE, WISCONSIN, A.

CURPORATIQN 0F WISCONSIN.

MAGNETIC SEPARATOR.

Specification of Letters Patent.

Patented Apr. 2U), 1%15.

Application filed August 7, 1911. Serial No. 642,613.

' To all whom it may concern a form of pulley construction in which, by

avoiding annular, neutral zones, and zones of little attraction, we are able to expose all the magnetite to substantially equal force. Also to provide a form of conveyer belt which, when passing over the magnetic pulley, will cause the magnetite to travel toward the center of the belt, thereby avoiding the tendency of such materials to pass-over and under the edge of the belt into direct contact with the poles of the magnetite.

In the following description, reference is had to the accompanylng drawings in which Figure 1 is a side elevation of the mag netic separator, embodying my invention. Fig. 2 is a detail plan view of the end portion of the same at which the magnetic pulley is located. Fig. 3 is an enlarged detail view in side elevation of the magnetic pulley, and a portion of the belt, showing a receiver for the magnetite in operative relation thereto, said receiver being partially illustrated in section. Fig. 4 is a detail view of the magnetic pulley with some of the nonmagnetizable collars removed to show the arrangement of the pole pieces and magnetic gap. Fig. 5 is an enlarged longitudinal sectional view of one end portion of the magnetic pulley.

lLike parts are identifiedby the same reference characters throughout the several views.

The pulley shaft 1 is provided'with a series of radially extending disks 2, which serve as pole pieces, the magnetic coils being so wound upon the shaft between such pole pieces or disks, that said pole pieces will be alternately of opposite polarity. Near their outer margins these pole pieces are provided with flanges 5, and the free margins of these flanges are curved in a sinusoidal line. The opposite edges of the flanges 5 are parallel, and the space between the margins of said flanges constitutes a sinuous gap 6 of uniform width. The gap 6 may be an air gap, or it may be filled with solid non-magnetic material.

The outer or peripheral surfaces of the flanges 5 are cylindrical, and are preferably covered by rings 8, the outer surfaces of which coincide with the peripheral surfaces of the disks 2, the ring 8 and the peripheries of the disks 2, forming a continuous cylinder or drum surface. The inner surfaces of the flanges 5, near their margins, extend convergingly toward the outer surfaces, forming a comparatively thin edge at the gap.

A belt 10 serves as a conveyer for the material to be separated. Such material is fed to the belt conveyer through a hopper 11, or by any other suitable means. The belt conveyer extends over .the magnetic pulley above described, and also over a pulley or roller 12, which is preferably formed of wood. The shaft 1 is rotated from any suitable source of power, by a belt or chain 15, and pulley or sprocket wheel 16, the latter being mounted upon shaft 1. The pulleys are rotated so that the belt conveyer travels in the direction indicated by the arrows in Figs. 1, 2 and 3, and the material on the conveyer is carried over the magnetic pulley. The non-magnetic material is permitted to drop vertically from the outer surface of the magnetic pulley, while the magnetite adheres to the belt, while the latter is in contact with the pulley. But as the belt itself is of non-magnetizable material, the magnetite will drop immediately after the belt leaves the pulley surface into a receiver 17. Referring to Fig. 4, it will be observed that it will notbe possible for any of the magnetite to pass downwardly over the magnet1c pulley or drum, and escape the magnetic attraction by following any one of the gaps 6, for the reason that sald gaps are sinusoidal, and at several points in its downward passage, the magnetlte will be in close proximity to, or directly over one of the polar flanges 5, and will be attracted thereto. It will also be observed that by covering the polar flanges 5, by non-magnetizable rings 8, while leaving the peripheries of the disks 2 exposed, the magnetic attraction will be substantially equalized over the entire surface of the drum; whereas, if the outer surfaces of the flanges 5 coincide with the peripheries of the disks 2-, the magnetic attraction exerted by the flanges would be more intense than that exerted directly by thedisks. 1

To prevent the magnetite from passing to the ends of the magnetic pulley or drum across and underneath the margins ofthe belt conveyer, we provide the ends of the drum with disk shaped end pieces 9, of nonmagnetizable material. We also. provide the conveyer belt with-magnetizable rivets 20, which are arranged in rows, extending angularly inwardly from the respective side margins of the belt, forming a V-shaped angle along the longitudinal center line of the belt. These rows also extend inwardly and rearwardly with reference to the direction of conveyer movement. None of the rivets 20 are located directly at the belt margins, and therefore, as the rivets pass over the magnetic drum or pulley, the magnetite near the belt margins will tend to collect around. the outer rivets, and subsequently when such rivets leave the magnetic drum or pulley, the magnetite will tend to move toward the next rivet which is still in contact with the drum surface. The rivets are, of course, formed of magnetizable material, and are therefore adapted to suecessively draw the magnetite inwardly toward the apexes of the converging rows. By this arrangement, we have successfully counteracted the tendency of the magnetite to pass outwardly across the marginal edges of the belt into direct contact with the pulley. 5

Having thus described our invention, what we claim as new, and desire to secure by Letters Patent, is

1. A magnetic separator, consisting of a supporting member provided with a set of polar projections having exposed annular peripheral flanges, electro-niagnetic windings between said polar projections, flanges on said projections partially overhanging said windings, the opposing margins of the flanges being sinuously curved to approach into and recede from an annular zone constituting a magnetic gap between each pair of pole pieces, and non-magnetizable coverings for said flanges and gaps.

2. A magnetic separator provided with a plurality of annular pole pieces of opposite polarity separated by a magnetic gap, extending in a sinusoidal curve adjacent to its outer surface, the central portion of said gap being continuous in a plane transverse to the axis of the separator, said magnetic gaps and the sinusoidal margins of the pole pieces being covered by non-magnetizable material, and an annular zone being left exposed between the gaps, and constituting a magnetic zone, the covering of the sinusoidal margins of the pole pieces filling portions of the magnetic field of greatest density, to equalize the density of the field adjacent to the periphery of the separator.

3. A magnetic separator, comprising the combination with a support, of a series of pole pieces provided with outer surfaces, flanges projecting laterally from said pole pieces toward those of the adjacent pole pieces, and non-magnetizable shields covering said flanges and coinciding with those of the pole pieces to form a continuous smooth surface, saidvflanges having their inner surfaces converging outwardly and forming comparatively short edges opposed to the similar edges of the flanges on the opposing pole pieces.

4. The combination of a separating magnet, a conveyer belt for delivering material thereto, and rows of magnetizable projections on said conveyer belt arranged in rows along lines converging inwardly from the margins of the belt and rearwardly with reference to the direction of conveyer movement, said projections being spaced from each other in each row at less distances than the width of the spaces between the rows.

5. A magnetic drum separator, comprising the combination of supports, exciting coils, annular magnetic pole pieces forming a series of narrow peripheral belts separated from each other by annular zones which include the gaps between the pole pieces, said pole pieces being separated from each other by sinusoidal gaps, each traversing one of said zones from side to side, said pole pieces having laterally projecting annular flanges in said zones and borderin said aps which are sinusoidal in form and said anges having their inner surfaces converging outwardly toward the periphery of the separator and forming with the outer surfaces comparatively thin edges at the polar ga s,

together with a set of annular coverings or the gap zones substantially as described.

In testimony whereof we affix our signatures in the presence of two witnesses.

MYRON DINGS. ROBERT A. MANEGOLD.

Witnesses Lsvnns'r'r C. WHEELER, I. D. BREMER. 

